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Length • Exact factor

Lignes → Millimeters

ligne → mm

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Reverse Conversion

What it is

The ligne (often written L) is the button-trade unit for diameter. 1 ligne = 1/40 inch = 0.635 mm. It is not the old Paris typographic line, not Chinese market cun, and not Japanese wasai sun.

How to use

Multiply the L number on a button card or pattern by 0.635 to get millimeters. 24 ligne = 15.24 mm. Reverse: mm / 0.635. The converter above uses this factor.

mm = ligne × 0.635

Example: 1 ligne = 0.635 mm

Common uses

Shirt buttons about 16-18 ligne (about 10-11.5 mm); suit front buttons often 24-28 ligne; coats 32-36 ligne. A 3/4-inch button on a pattern is 30 ligne. For buying buttons, buttonholes, and imported notions.

Conversion tips

40 ligne = 1 inch. 16L ~ 10 mm, 18L ~ 11.4 mm, 24L ~ 15.2 mm, 30L = 19.05 mm. Do not mix ligne with denier in the same column.

ligne → mm Reference Table

ligne mm
16 ligne 10.16 mm
18 ligne 11.43 mm
24 ligne 15.24 mm
28 ligne 17.78 mm
30 ligne 19.05 mm
32 ligne 20.32 mm
36 ligne 22.86 mm

Calculated from factors marked exact in the unit registry.

Frequently Asked Questions

Length More Conversions

m → ftft → mcm → inin → cmkm → mimi → kmmm → inin → mmm → ydyd → mft → inin → ft里 → kmkm → 里尺 → mm → 尺mi → mm → mift → cmcm → ftcm → mmmm → cmkm → ydyd → kmnmi → kmkm → nmiyd → ftft → ydmi → ydyd → mimi → ftft → mim → cmcm → mm → mmmm → mkm → mm → kmnmi → mimi → nmiin → ydyd → inµm → mmmm → µmft → mmmm → ftm → inin → mly → kmkm → lyyd → cmcm → yd尺 → cmcm → 尺寸 → cmcm → 寸尺 → cmcm → 尺寸 → cmcm → 寸mm → ligneligne → cmcm → ligneligne → inin → ligne寸 → inin → 寸尺 → inin → 尺寸 → inin → 寸尺 → inin → 尺丈 → m里 → min → µmµm → mnm → µmmi → 里dm → cmpm → cmkm → pmlight-s → mkm → mmly → cmcm → nmin → lyµm → incm → kmcm → lycm → µmcm → mift → lyft → nmiin → mikm → cmly → inly → ydm → nmµm → lynm → lynm → minm → mmyd → lyyd → mmyd → pmµm → pmpm → kmpm → mmcm → dmdm → kmdm → mdm → mmdm → ydin → pmkm → dmlight-s → dmm → dmm → pmmi → dmmi → pmmm → dmmm → pmpm → inpm → lypm → nmau → cmcm → auftm → mmftm → nmft → ftmau → µmftm → inftm → kmftm → 里ftm → mftm → mily → ftmmi → auyd → ftmpc → cm

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